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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License (the "License").
      6  * You may not use this file except in compliance with the License.
      7  *
      8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
      9  * or http://www.opensolaris.org/os/licensing.
     10  * See the License for the specific language governing permissions
     11  * and limitations under the License.
     12  *
     13  * When distributing Covered Code, include this CDDL HEADER in each
     14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     15  * If applicable, add the following below this CDDL HEADER, with the
     16  * fields enclosed by brackets "[]" replaced with your own identifying
     17  * information: Portions Copyright [yyyy] [name of copyright owner]
     18  *
     19  * CDDL HEADER END
     20  */
     21 
     22 /*
     23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1988 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     31 
     32 #include "lint.h"
     33 #include "file64.h"
     34 #include "mtlib.h"
     35 #include <sys/types.h>
     36 #include <stdio.h>
     37 #include <stdlib.h>
     38 #include <thread.h>
     39 #include <synch.h>
     40 #include "stdiom.h"
     41 
     42 
     43 void
     44 setbuf(FILE *iop, char *abuf)
     45 {
     46 	Uchar *buf = (Uchar *)abuf;
     47 	int fno = GET_FD(iop);  /* file number */
     48 	int size = BUFSIZ - _SMBFSZ;
     49 	Uchar *temp;
     50 	rmutex_t *lk;
     51 
     52 	FLOCKFILE(lk, iop);
     53 	if ((iop->_base != 0) && (iop->_flag & _IOMYBUF))
     54 		free((char *)iop->_base - PUSHBACK);
     55 	iop->_flag &= ~(_IOMYBUF | _IONBF | _IOLBF);
     56 	if (buf == 0) {
     57 		iop->_flag |= _IONBF;
     58 #ifndef _STDIO_ALLOCATE
     59 		if (fno < 2) {
     60 			/* use special buffer for std{in,out} */
     61 			buf = (fno == 0) ? _sibuf : _sobuf;
     62 		} else	/* needed for ifndef */
     63 #endif
     64 		if (fno < _NFILE) {
     65 			buf = _smbuf[fno];
     66 			size = _SMBFSZ - PUSHBACK;
     67 		} else
     68 		if ((buf = (Uchar *)malloc(_SMBFSZ * sizeof (Uchar))) != 0) {
     69 			iop->_flag |= _IOMYBUF;
     70 			size = _SMBFSZ - PUSHBACK;
     71 		}
     72 	} else {	/* regular buffered I/O, standard buffer size */
     73 		if (isatty(fno))
     74 			iop->_flag |= _IOLBF;
     75 	}
     76 	if (buf == 0) {
     77 		FUNLOCKFILE(lk);
     78 		return;		/* malloc() failed */
     79 	}
     80 	temp = buf + PUSHBACK;
     81 	iop->_base = temp;
     82 	_setbufend(iop, temp + size);
     83 	iop->_ptr = temp;
     84 	iop->_cnt = 0;
     85 	FUNLOCKFILE(lk);
     86 }
     87